JP2016204248A - Apparatus and method for manufacturing float glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing float glass, capable of suppressing a pressure fluctuation in a float bus and a dross box and the intrusion of outside air to contribute to manufacturing a thin sheet glass having high quality.SOLUTION: The apparatus for manufacturing float glass comprises: a float bus for storing a molten metal; a slow cooling furnace conveying a glass ribbon molded in a band plate shape on the molten metal; a dross box provided between the float bus and the slow cooling furnace; and drapes provided in the dross box and arranged above a plurality of lift out rolls for conveying the glass ribbon from the float bus to the slow cooling furnace. The drape has reinforcing means on the downstream side in the conveying direction of the glass ribbon.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a float glass manufacturing apparatus and a float glass manufacturing method.

  The float method is known as one of the typical manufacturing methods of plate glass. In the float process, molten glass is continuously supplied to the bath surface of the molten metal in the float bath to form a strip-like glass ribbon. After the glass ribbon is drawn from the bath surface, it is drawn out from the outlet of the float bath and conveyed by a lift-out roll disposed in the dross box. Next, the glass ribbon is transported into a slow cooling furnace and gradually cooled while being transported by a transport roll (rare roll). Subsequently, the glass ribbon is carried out of the slow cooling furnace, cooled to near room temperature, and then cut into a predetermined dimension to become a glass plate as a product. Molten tin is usually used as the molten metal.

  Tin is a simple substance and is oxidized to tin oxide (SnO2) when heated to high temperature in an atmosphere containing oxygen. In a float glass manufacturing apparatus consisting of a float bath, dross box, slow cooling furnace, etc., there is a problem that high temperature molten tin is oxidized by the oxygen that has entered the float bath and tin oxide is generated and adheres to the surface of the glass ribbon. . In view of this point, a reducing gas such as hydrogen, nitrogen, or a reducing gas mixture of hydrogen and nitrogen is supplied into the float bath, and the inside of the float bath is made positive pressure from the outside air, so that the outside air containing oxygen enters. Refusing to.

  The inside of the dross box provided between the float bath and the slow cooling furnace is supplied with the reducing mixed gas from the above-mentioned float bath, and the inside of the dross box is maintained at atmospheric pressure or more to generate and attach tin oxide. There is a need to maintain an environment that prevents this.

  However, outside air containing oxygen enters from a gap on the side of the slow cooling furnace of the dross box, the pressure in the dross box fluctuates, and tin oxide is generated and adhered to the surface of the glass ribbon in the dross box. Then, defects, such as peeling and distortion, occur in the manufactured glass sheet, and the quality is lowered.

  In recent years, thin glass has been used for televisions, smartphones, and the like, and if there are minute defects on the surface of such thin glass, it directly leads to strength deterioration.

  In view of the above problems, in order to prevent the pressure in the float bath and the dross box from fluctuating and the outside air containing oxygen from entering, a metal made of a drape called a drape is placed above the liftout roll of the dross box. There is a technique for arranging a curtain (see, for example, Patent Document 1).

JP 2001-146433 A

  However, the technique of Patent Document 1 has the following problems.

  The upstream surface of the drape glass ribbon in the conveying direction is always under pressure from the float bath. Therefore, as time passes, the drape is warped and the downstream surface in the conveying direction of the glass ribbon swells.

  As a result, the pressure in the float bath and the dross box fluctuates and the intrusion of outside air is allowed, causing a defect in the thin glass to be manufactured and reducing the quality.

  This invention is made in view of the said subject, Comprising: The float glass and the manufacturing apparatus of the float glass which can suppress the pressure fluctuation in a dross box and intrusion of external air, and can contribute to manufacture of a high quality sheet glass. It is to provide.

In order to solve the above problems, according to one aspect of the present invention,
A float bath containing molten metal; a slow cooling furnace in which a glass ribbon formed in a strip shape on the molten metal is carried; a dross box provided between the float bath and the slow cooling furnace; An apparatus for producing float glass comprising a drape disposed on top of a plurality of lift-out rolls for conveying the glass ribbon from the float bath to the slow cooling furnace,
The drape is provided with a reinforcing device on the downstream side in the conveying direction of the glass ribbon, and a float glass manufacturing apparatus is provided.

  According to one embodiment of the present invention, it is possible to provide a float glass manufacturing apparatus that can contribute to the manufacture of high-quality thin glass by suppressing pressure fluctuations in the float bath and the dross box and intrusion of outside air.

It is a partial cross section figure of the manufacturing apparatus of the float glass which concerns on the 1st Embodiment of this invention. It is a schematic block diagram of the drape which comprises the manufacturing apparatus of the float glass which concerns on the 1st Embodiment of this invention, (A) is II sectional view taken on the line of (B), (B) is a drape. It is a front view. It is a schematic block diagram of the drape which comprises the manufacturing apparatus of the float glass which concerns on the 2nd Embodiment of this invention, (A) is the II-II arrow sectional drawing of (B), (B) is a drape. It is a front view. It is a schematic block diagram which shows the modification of the drape which comprises the manufacturing apparatus of the float glass which concerns on the 2nd Embodiment of this invention, (A) is III-III arrow sectional drawing of (B), (B ) Is a front view of the drape. It is a figure which shows the experimental result in a comparative example and an Example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted. In this specification, “to” representing a numerical range means a range including numerical values before and after the numerical range. In the following description, “downstream side” refers to the downstream side in the conveyance direction of the glass ribbon, and “upstream side” refers to the upstream side in the conveyance direction of the glass ribbon.

[First Embodiment]
(Float glass manufacturing equipment)
FIG. 1 is a partial cross-sectional view of a float glass manufacturing apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the float glass manufacturing apparatus 1 includes a float bath 10, a slow cooling furnace 20, and a dross box 30 provided between the float bath 10 and the slow cooling furnace 20.

  The glass ribbon 2 formed to have a desired width and thickness on the bath surface 12 of the molten metal 11 in the float bath 10 is pulled up from the bath surface 12 by the traction force of the lift-out roll 4 and the transport roll 21. Next, the glass ribbon 2 is carried into the dross box 30 from the outlet 13 of the float bath 10 and conveyed by the lift-out roll 4. Subsequently, the glass ribbon 2 is carried into the slow cooling furnace 20 and gradually cooled while being transported by a transport roll (rare roll) 21. Thereafter, the glass ribbon 2 is carried out of the slow cooling furnace 20 and cooled to near room temperature, and then cut into a predetermined size to form a glass plate as a product.

The glass used for the glass plate is appropriately selected according to the use of the glass plate. For example, when the glass plate is used for a plasma display glass substrate, a glass having a high strain point temperature and a large thermal expansion coefficient is used. Further, when the glass plate is used for a glass substrate for liquid crystal display, alkali metal adversely affects the quality of the liquid crystal display, and therefore, alkali-free glass substantially not containing alkali metal is used. Here, “non-alkali glass” refers to a glass that does not intentionally contain an alkali metal oxide such as Li ₂ O, Na ₂ O, or K ₂ O.

  The float bath 10 contains a molten metal 11. The upper space in the float bath 10 is filled with a reducing mixed gas containing nitrogen and hydrogen in order to prevent the molten metal 11 from being oxidized. Further, the upper space in the float bath 10 is set higher than the atmospheric pressure in order to prevent the inflow of air from the outside. A reducing atmosphere flows out toward the dross box 30 from the outlet 13 of the float bath 10 from which the glass ribbon 2 is drawn. A heater 18 that adjusts the glass ribbon 2 to a temperature at which plastic deformation is possible is provided in the vicinity of the outlet 13 in the float bath 10.

  The slow cooling furnace 20 is opened to the outside at the downstream outlet. Therefore, the inside of the slow cooling furnace 20 is basically an atmosphere containing oxygen. The inside of the slow cooling furnace 20 communicates with the inside of the float bath 10 through the inside of the dross box 30.

  In the slow cooling furnace 20, a heater 28 and the like are provided in addition to the transport roll 21. Each of the transport rolls 21 is rotationally driven by a driving device such as a motor, and transports the glass ribbon 2 in the horizontal direction by the driving force.

  The dross box 30 may have a heat insulating structure. For example, as shown in FIG. 1, at least a part of the upper outer wall 31 is covered with a heat insulating material 33 and at least a part of the lower inner wall 32 is heat insulating material. 34. A general thing is used as the heat insulating materials 33 and 34. By using the heat insulating materials 33 and 34, heat radiation from the dross box 30 can be suppressed, the temperature distribution of the glass ribbon 2 can be stabilized, and the warpage of the product can be suppressed.

  In the dross box 30, in addition to the lift-out roll 4 (hereinafter also simply referred to as “roll 4”), a contact member 5, a drape 6, a heater 7, and the like are provided. Each of the rolls 4 is rotationally driven by a driving device such as a motor, and conveys the glass ribbon 2 obliquely upward by the driving force. The number of rolls is not particularly limited as long as it is plural. A contact member 5 is provided below the roll 4.

  The contact member 5 is made of carbon or the like. Each of the contact members 5 is in sliding contact with the outer peripheral surface of the corresponding roll 4 to partition the lower space of the glass ribbon 2 into a plurality of spaces 35 to 38.

  The drape 6 is a shielding wall that is provided above the glass ribbon 2 and above the roll 4 and shields the space above the glass ribbon 2. In the space above the glass ribbon 2, the reducing mixed gas flowing out from the outlet 13 of the float bath 10 flows toward the inlet 23 of the slow cooling furnace 20 (the outlet 39 of the dross box 30).

  The drape 6 restricts the entry of oxygen from the slow cooling furnace 20 and restricts the increase of the oxygen concentration in the dross box 30. Thereby, combustion of hydrogen of the reducing gas mixture can be suppressed, and temperature fluctuation and local heating due to the hydrogen combustion flame can be suppressed. The drape 6 is arranged so as to be slightly separated (for example, 1 cm) from the upper surface of the glass ribbon 2 so as not to disturb the conveyance of the glass ribbon 2. The drape 6 is suspended by the outer wall 31, and a plurality of drapes 6 are provided along the conveyance direction of the glass ribbon 2.

  The float glass manufacturing apparatus 1 of the present embodiment is characterized by the configuration of the drape 6 described above, and in particular has a configuration that can prevent the drape 6 from bulging downstream and warping and deforming. This point will be described later.

  The heaters 7 are provided on both upper and lower sides of the glass ribbon 2 so as to be separated from each other, and are provided in a plurality of rows along the conveying direction of the glass ribbon 2. For example, as shown in FIG. 1, the heaters 7 in each row are provided between the drapes 6 and between the contact members 5. The heaters 7 in each row may be divided in the width direction of the glass ribbon 2.

(drape)
Next, the drape 6 constituting the float glass manufacturing apparatus 1 according to the first embodiment will be described in detail with reference to the drawings. FIG. 2 shows a schematic configuration of the drape. 2A is a cross-sectional view taken along the line II of FIG. 2B, and FIG. 2B is a front view of the drape. 2B is a front view seen from the downstream side with respect to the conveying direction of the glass ribbon 2.

  The drape 6 has a frame portion 60 and a corrugated iron plate portion 61. The frame portion 60 includes two frame members 60A and 60B so as to sandwich and support the upper surface and the back surface of the corrugated iron plate portion 61. The frame material 60 </ b> A is disposed on the upstream side surface (front surface) of the corrugated iron plate portion 61, and the frame material 60 </ b> B is disposed on the downstream side surface (back surface) of the corrugated iron plate portion 61. The frame members 60A and 60B are stainless steel angle members, which are continuously arranged along the longitudinal direction at the upper position of the corrugated iron plate portion 61, and screw bolts 8 are screwed into bolt holes provided at regular intervals. The upper part of the corrugated iron plate part 61 may be clamped. The frame materials 60A and 60B have a thickness of 2.5 mm to 3.5 mm, preferably about 3 mm, and a height (length) of 80 mm to 100 mm, preferably about 93 mm.

  The corrugated iron plate portion 61 is a corrugated iron plate made of stainless steel having a corrugated shape, and a thin one having a thickness of 0.1 mm to 0.2 mm, preferably about 0.15 mm is used. Since the drape 6 of the present embodiment has the configuration including the corrugated iron plate portion 61, the drape 6 can be lightweight and exhibit a certain degree of rigidity, and can be deformed with respect to a large external pressure.

  That is, the drape 6 can exhibit a certain degree of rigidity due to the corrugated shape of the corrugated iron plate with respect to the reducing mixed gas supplied from the float bath 10. The glass ribbon 2 is conveyed directly below the lower end of the drape 6. Since there is only a slight gap (for example, 1 cm) between the drape 6 and the glass ribbon 2, the glass ribbon 2 is cracked, and if the broken glass (cullet) is on the upper surface of the glass ribbon 2, the lower end of the drape 6 I hit the club. At this time, if the drape 6 has a high rigidity, the conveying flow of the glass ribbon 2 is stopped, and the production of the float glass by the manufacturing apparatus 1 must be stopped. However, since the thin corrugated iron plate portion 61 is used, even if the cullet on the glass ribbon 2 comes into contact with the lower end portion of the corrugated iron plate portion 61, the corrugated iron plate portion 61 does not actively deform and stop the conveyance flow.

  However, if the corrugated iron plate portion 61 alone withstands the reducing mixed gas supplied from the float bath 10, the downstream side surface swells and deforms immediately with the passage of time.

  Therefore, the drape 6 of this embodiment is characterized in that a reinforcing means 62 is provided on the downstream side in the transport direction of the glass ribbon 2.

  The reinforcing means 62 (corresponding to a deformation prevention plate) is a plurality of deformation prevention plates 62 installed at intervals in the width direction (longitudinal direction) of the drape 6. The deformation prevention plate 62 is an elongated stainless steel plate having a width of 30 mm to 50 mm, preferably about 40 mm, and a thickness of 2 mm to 4 mm, preferably about 3 mm. That is, the deformation preventing plate 62 is formed thicker than the corrugated iron plate portion 61 to ensure rigidity and support force. Although the height (length) is appropriately changed depending on the length of the corrugated iron plate portion 61, the lower end of the deformation prevention plate 62 is higher than the lower end of the corrugated iron plate portion 61 by 80 mm to 120 mm, preferably about 100 mm. It is preferable to have a thickness.

  The deformation prevention plate 62 having the above-described structure is provided with a through hole at the upper position thereof that matches a bolt hole provided in common to the frame members 60A and 60B, and the bolt 8 described above is screwed into the through hole and both bolt holes. Then, it is attached to the frame material 60B. The lower end portion of the deformation preventing plate 62 does not need to be connected to the corrugated iron plate portion 61 by welding or the like. Of course, you may connect by welding etc. suitably. A plurality of the deformation prevention plates 62 are installed with an interval L of about 250 mm to 350 mm in the longitudinal direction of the continuous frame material 60B. The interval L is more preferably 300 mm.

  The drape 6 having the above-described configuration can prevent the downstream side surface (back surface) from bulging and deforming even if the upstream side surface (front surface) of the corrugated iron plate portion 61 continues to receive the reducing mixed gas by the plurality of deformation prevention plates 62. .

  Therefore, according to the float glass manufacturing method using the float glass manufacturing apparatus 1 having the drape 6 having the above-described configuration, pressure fluctuations in the float bath and the dross box and intrusion of outside air are suppressed, and the inside of the dross box 30 The pressure can be maintained within the target value, which can contribute to the production of high quality thin glass. Moreover, since the deformation | transformation of the drape 6 is suppressed, the adjustment operation accompanying a drape deformation | transformation, the necessity for replacement | exchange, etc. are lose | eliminated, the production loss in the meantime can be prevented, and it is excellent in work efficiency and economical efficiency.

  The deformation preventing plate 62 (reinforcing means) has a thickness of 2 mm to 4 mm, preferably about 3 mm, which is acceptable for the conveying force of the glass ribbon 2. The lower end of the deformation prevention plate 62 and the lower end of the corrugated iron plate portion 61 are configured such that the lower end of the deformation prevention plate 62 is disposed above the lower end of the corrugated iron plate portion 61. Therefore, even if the cullet on the glass ribbon 2 comes into contact with the lower end portion of the corrugated iron plate portion 61, it is possible to prevent the conveyance flow from being actively deformed and stopped.

[Second Embodiment]
Next, a float glass manufacturing apparatus according to a second embodiment of the present invention will be described. The present embodiment has a technical idea substantially the same as that of the first embodiment, and the difference will be mainly described below. In short, the structure of the drape reinforcement means is different. The thickness of each member is the same.

  The schematic structure of the drape which comprises the manufacturing apparatus of the float glass which concerns on FIG. 3 at 2nd Embodiment was shown. 3A is a cross-sectional view taken along the line II-II in FIG. 3B, and FIG. 3B is a front view of the drape. 3B is a front view seen from the downstream side with respect to the conveyance direction of the glass ribbon 2.

  The drape 600 of the second embodiment has reinforcing means 620. The reinforcing means 620 is configured such that the frame material 600B disposed on the downstream side in the conveyance direction of the glass ribbon 2 is formed longer than the frame material 600A disposed on the upstream side in the conveyance direction of the glass ribbon.

  That is, the frame material 600 </ b> B disposed on the downstream side surface (back surface) of the corrugated iron plate portion 610 has the same height (length) as the deformation preventing plate 62. The height is 240 mm to 300 mm, preferably about 270 mm. The lower end of the frame material 600B and the lower end of the corrugated iron plate portion 610 may be arranged such that the lower end of the frame material 600B is 80 mm to 120 mm, preferably about 100 mm above the lower end of the corrugated iron plate portion 610. Therefore, even if the cullet of the glass ribbon 2 comes into contact with the lower end portion of the corrugated iron plate portion 610, it is possible to prevent the conveying flow from being actively deformed and stopped.

  A plurality of openings 601 </ b> B are formed in the frame member 600 </ b> B constituting the reinforcing means 620 at a substantially central height position with a certain interval in the longitudinal direction (width direction). The weight of the drape 600 can be reduced by the opening 601B.

  The drape 600 constituting the float glass manufacturing apparatus according to the second embodiment has a smaller number of members than the first embodiment and is easy to assemble. Further, since the area of the reinforcing means 620 that contacts the downstream side surface of the corrugated iron plate portion 610 is larger than that of the reinforcing means 62 of the first embodiment, deformation or the like in which the downstream side surface of the corrugated iron plate portion 610 swells over the long term. Can be prevented. Of course, the effects described in the first embodiment can be obtained in the same manner.

(Modification)
The second embodiment is not limited to this, and may have a modification shown in FIG. FIG. 4 shows a modification of the drape constituting the float glass manufacturing apparatus according to the second embodiment. 4A is a cross-sectional view taken along the line III-III in FIG. 4B, and FIG. 4B is a front view of the drape. 4B is a front view seen from the downstream side with respect to the conveying direction of the glass ribbon 2.

  That is, the drape 600 is configured to have the extension portion 602B so that the lower end of the frame material 600B is at the same height as the lower end of the corrugated iron plate portion 610 at one end portion or both end portions.

  Usually, the glass ribbon 2 immediately below the drape 600 is narrower than the width of the drape 600, and the glass ribbon 2 does not exist at a position immediately below the both end portions of the drape 600. That is, it is not necessary to consider the conveyance stop of the glass ribbon 2 so much at both end portions. Therefore, the shielding rate in the dross box 30 can be further improved by forming the extension portion 602B in the frame material 600B at the both end portions so as to have the same height as the lower end of the corrugated iron plate portion 610.

(Float glass manufacturing method)
The manufacturing method of the float glass of this embodiment may be the same as the manufacturing method of the conventional float glass except installing the drape 6 or 600 described above in the dross box 30. With reference to FIG. 1 again, a method for manufacturing a float glass using the drape 6 or 600 having the above-described configuration will be described.

  For example, after supplying a glass raw material to the melting furnace set to about 1600 degreeC and obtaining molten glass, the molten glass is poured into the float bath 10 filled with molten tin, and the glass ribbon 2 is formed. The glass ribbon 2 carried out from the float bath 10 is conveyed by the lift-out roll 4 through the dross box 30 in which the drapes 6 and 600 are installed, and is supplied to the slow cooling furnace 20.

  Since the drapes 6 and 600 arranged in the dross box 30 effectively suppress deformation of the downstream side by the reinforcing means 62 and 620, the pressure in the float bath 10 and the dross box 30 fluctuates. The target value can be maintained by preventing. Furthermore, it is possible to suppress the intrusion of outside air from the inlet 23 of the slow cooling furnace 20, to prevent tin oxide from being generated and attached to the glass ribbon 2, and to provide a high-quality thin glass plate with few defects.

  The manufactured float glass is used as, for example, a glass substrate for display, a cover glass for display, and a window glass.

The float glass produced may be alkali-free glass when used as a glass substrate for a display. The alkali-free glass is a glass that does not substantially contain an alkali metal oxide such as Na ₂ O, K ₂ O, or Li ₂ O. The alkali-free glass may have a total content of alkali metal oxides of 0.1% by mass or less.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

  The present inventors prepared a drape without a deformation prevention plate (comparative example) and a drape with a deformation prevention plate (drape of the first embodiment) (example), and placed them in the dross box of the same environment. Was placed over 4 months to confirm the drape deformation, the pressure in the dross box, and the quality of the manufactured thin glass. Moreover, the plate | board thickness of the thin plate glass manufactured was 0.7 mm or less.

  The frame material and corrugated iron plate used in the comparative examples and examples are made of stainless steel. The thickness of the frame material was 3 mm, the corrugated iron plate portion was a corrugated corrugated iron plate, and the thickness was 0.15 mm. The deformation prevention plate of the example was made of stainless steel having a plate thickness of 3 mm, a width of 40 mm, and a height (length) of 270 mm.

  The results after 4 months are shown in FIG.

  Paying attention to thermal deformation, in the example, no deformation was observed in the corrugated iron plate portion. In the comparative example without the deformation prevention plate, it was confirmed that the central portion of the corrugated iron plate portion greatly bulges downstream.

  With the deformation of the corrugated iron plate portion, the level jack adjustment for adjusting the gap between the lower end of the corrugated iron plate portion and the glass ribbon was performed only once at the time of insertion in the example, and no adjustment was made thereafter. In the comparative example, it was performed 16 times in 4 months.

  It was not necessary to change the drape once even in the example. The comparative example was deformed so that the drape had to be replaced two months after the start.

  Fluctuations in pressure in the float bath and the dross box hardly changed in the examples, and the target pressure could be maintained. In the comparative example, the pressure fluctuated significantly.

  As for the quality of the manufactured thin glass, in the examples, defects such as dross (adhesion of tin oxide), peeling, cracking, and warping were not observed. In the comparative example, the above defects were confirmed.

  Incidentally, even in the drape 600 shown in the second embodiment, no major deformation is observed, there is no need for long-term replacement, and it is confirmed that the pressure in the dross box is good and the quality is good. Yes.

  As described above, in the float glass manufacturing apparatus according to the present invention, the drape disposed in the dross box has the configuration in which the reinforcing means having the above configuration is provided on the downstream side in the conveyance direction of the glass ribbon. Therefore, the pressure fluctuation in the float bath and the dross box and the intrusion of outside air can be suppressed, the pressure in the dross box 30 can be kept within the target value, and it can contribute to the manufacture of high quality thin glass. In addition, since the deformation of the drape is suppressed, there is no need for adjustment work or replacement accompanying the drape deformation, and production loss during that time can be prevented, resulting in excellent work efficiency and economy.

  As mentioned above, although embodiment of the manufacturing apparatus of float glass, the manufacturing method of float glass, etc. were described, this invention is not limited to the said embodiment etc., In the range of the summary of this invention described in the claim Various modifications and improvements are possible.

  In particular, the shape and configuration of the reinforcing means described above are not limited to this, and it is only necessary to have a shape and configuration that can suppress drape deformation. For example, reinforcing means having a shape and a configuration extending in the width direction may be implemented below the corrugated iron plate portion constituting the drape.

DESCRIPTION OF SYMBOLS 1 Float glass manufacturing apparatus 2 Glass ribbon 10 Float bath 11 Molten metal 12 Bath surface 13 Outlet 18 Heater 20 Slow cooling furnace 21 Transport roll 23 Inlet 28 Heater 30 Dross box 31 Outer wall 32 Inner wall 33, 34 Insulating material 35-38 Space 39 Outlet 4 Liftout roll 5 Contact member 6, 600 Drape 60 Frame portion 60A, 60B, 600A, 600B Frame material 61, 610 Corrugated iron plate portion 601B Opening portion 602B Extension portion 62 Reinforcing means (deformation prevention plate)
620 Reinforcing means 7 Heater

Claims (10)

A float bath containing molten metal; a slow cooling furnace in which a glass ribbon formed in a strip shape on the molten metal is carried; a dross box provided between the float bath and the slow cooling furnace; An apparatus for producing float glass comprising a drape disposed on top of a plurality of lift-out rolls for conveying the glass ribbon from the float bath to the slow cooling furnace,
The drape is an apparatus for producing float glass, characterized in that a reinforcing means is provided on the downstream side in the conveying direction of the glass ribbon. The drape has a frame part and a corrugated iron plate part,
The frame part is
The apparatus for producing float glass according to claim 1, wherein the corrugated iron plate part is disposed on each of a downstream side and an upstream side of the corrugated iron plate part in a conveyance direction of the glass ribbon, and sandwiches the corrugated iron plate part. The reinforcing means is
The apparatus for producing float glass according to claim 1 or 2, wherein a plurality of deformation prevention plates are installed at intervals in the longitudinal direction of the drape. The reinforcing means is
The float glass according to claim 1 or 2, wherein the frame portion disposed on the downstream side in the conveyance direction of the glass ribbon is formed longer than the frame portion disposed on the upstream side in the conveyance direction of the glass ribbon. Manufacturing equipment.   The float glass manufacturing apparatus according to claim 2, wherein a lower end of the reinforcing means is disposed above a lower end of the corrugated iron plate part.   The float glass manufacturing apparatus according to claim 3, wherein the plurality of deformation prevention plates are arranged with an interval of 250 mm to 350 mm.   The apparatus for manufacturing a float glass according to claim 2, wherein the reinforcing means is thicker than the corrugated iron plate portion.   The said reinforcement means is a manufacturing apparatus of the float glass as described in any one of Claims 1-5 which has thickness of 2.5 mm-3.5 mm.   The said corrugated iron plate part is a manufacturing apparatus of the float glass of Claim 2 which has thickness of 0.1 mm-0.2 mm.   The manufacturing method of the float glass using the manufacturing apparatus of the float glass as described in any one of Claims 1-9.

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